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    <title>Document</title>
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<body>
    <script>
        function test7(name,age){
            return `姓名${name},年龄${age}`;
        }

        var test8 = (name,age) => `姓名${name},年龄${age}`;
        // 当只有一行 return 不用写  自动返回 


        // ''+变量+''+变量+变量+''
    </script>
</body>
</html>